The remarkable cold of the past weekend will give way to summer-like warmth at week’s end, but we have another cold air mass to go through before we get there. A cold front will cross the region today as low pressure deepens over New England. As a result, temperatures tonight and tomorrow night will fall back into the 30’s for overnight lows and frost will be possible by early Tuesday and again by early Wednesday. As another low pressure system approaches towards the end of the week, our temperatures will soar on both Friday and Saturday to near the 85 degree mark for highs and there will be a chance of showers and thunderstorms on both days.
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A remarkable cold air outbreak is coming to the region for Friday night and Saturday and it will be accompanied by a rain-changing-to-snow event in many interior sections of the Mid-Atlantic/Northeast US. The weather will become quite a bit more active later today as a strong cold front advances this way from the Upper Midwest and low pressure begins to develop over the Tennessee Valley. This low pressure system will push along the southeastward-advancing cold frontal boundary zone and rain is likely to return to the region during the afternoon and evening hours. As colder air wraps into the system tonight, the rain is likely to change to snow in a good part of the Mid-Atlantic/Northeast US; especially, across interior higher elevation locations of upstate PA, NY and New England where accumulations are possible. In fact, there can be a changeover from rain-to-snow showers later tonight all the way into the suburban locations well to the north and west of DC. This low pressure system will intensify dramatically by the time it reaches the Gulf of Maine on and a deepening pressure gradient will result in powerful winds to go along with the unusual cold. Winds on Saturday can gust to 50 mph or so raising the chance for scattered power outages. Looking ahead, the overall weather pattern that has resulted in multiple cold air outbreaks from Canada into the central and eastern US during the past several weeks is likely to finally break down during the third week of May, but we’ll have to endure some pain before we get to those expected warmer-than-normal conditions.
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A remarkable cold air outbreak is coming to the northeastern quadrant of the nation for Friday night and Saturday and it will be accompanied by a rain-changing-to-snow event for many interior sections of the Mid-Atlantic/Northeast US. This cold blast is likely to result in some of the coldest daily temperatures ever recorded both at the surface and in the upper atmosphere and, in some cases, monthly temperature records may be set. In addition, some spots might see their latest measurable snowfall in the Friday night/Saturday time period. Some interesting notes…in Philadelphia, there has not been a temperature in the 30’s on May 9th or later in more than fifty years (1966) and it could happen on both Saturday (9th) and Sunday (10th) mornings. In Buffalo, the predicted temperature of -40°C this weekend at the 500 millibar level would shatter the previous record of -35.7°C for the entire month of May. In Baltimore, there has not been a measurable snowfall in the month of May since 1872 and the latest on record there is May 9th (1923).
In addition to the cold and potential snow, winds will become an important factor as well on Saturday with gusts past 50 mph on the table in the Mid-Atlantic/Northeast US and this will raise the chance for scattered power outages. Looking ahead, the overall weather pattern that has resulted in multiple cold air outbreaks from Canada into the central and eastern US during the past several weeks is likely to finally break down during the third week of May, but we’ll have to endure some pain before we get to those expected warmer-than-normal conditions.
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Quite an amazing outbreak of cold air will arrive on Friday night and the cold frontal passage may actually be accompanied by a rain-changing-to-snow event in part of the Mid-Atlantic region – perhaps even in the higher elevation locations to the north and west of Route I-95. Saturday will turn out to be a very windy day with gusts possible to 50 mph and an unusually cold day for this time of year with temperatures perhaps 20+ degrees below normal. In addition to the wind and the cold, there can be a rain or snow shower on Saturday as the atmosphere will be very unstable given the extremely anomalous upper-level low pressure system that will be sitting over the Northeast US. While Sunday, Mother’s Day, will remain colder-than-normal and get off to a very cold start, the afternoon will become much more bearable as there should be far less in the way of wind when compared to Saturday and some sunshine. Looking ahead, the overall weather pattern that has resulted in cold air outbreaks for the central and eastern US in recent weeks finally looks like it may break down during the third week of May.
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Today is an unusually chilly day in the Mid-Atlantic region with temperatures far below-normal for the 6th of May aided by a low-level easterly flow of air and thick cloud cover. In fact, high temperatures today in much of the Mid-Atlantic region will be confined to levels rarely experienced for this time of year. Believe it or not, this air mass may pale in comparison to what is on the way for the early part of the weekend.
Quite an amazing outbreak of cold air will arrive in the Mid-Atlantic region and Northeast US on Friday night and the cold frontal passage may actually be accompanied by a rain-changing-to-snow event – even into higher elevation suburban locations just to the north and west of I-95. Saturday will turn out to be a very windy and unusually cold day in much of the northeastern quadrant of the nation with temperatures in the DC-to-Philly-to-NYC perhaps more than twenty degrees below normal. While Sunday, Mother’s Day, will remain colder-than-normal, the afternoon will become much more bearable when compared to Saturday as there should be far less in the way of wind and plenty of sunshine. Looking ahead, cold air outbreaks will likely continue into mid-May across the central and eastern US, but a pattern change to warmer looks like it’ll begin during the 3rd week of the month - and tropical season may not be far behind.
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Showers will continue today as low pressure intensifies off-shore and it’ll be unusually cool as the thick cloud cover will combine with an easterly flow to keep highs confined to the low-to-mid 50’s. These kind of highs could very well end up being some of the lowest maximum temperatures ever recorded for the 6th of May. After a breezy and cool day on Thursday, more rain will push into the Mid-Atlantic region on Friday afternoon as an even stronger low pressure system moves in this direction from the Tennessee Valley and there can be rain and/or snow showers on Friday night. This system will intensify significantly by the time it reaches the New England coastline on Saturday morning and it’ll usher in a very cold air mass for this time of year. Not only will it be an unusually cold day for this part of the nation on Saturday, but it’ll be very unstable as well with an extremely strong upper-level low sitting right on top of the region. As a result, NW winds will become very strong and there can even be a rain or snow shower in the area. Mother’s Day (Sunday) will get off to a very cold start and it’ll stay on the cool side of normal in the afternoon; however, the PM hours should be a lot more bearable than Saturday with far less wind and plenty of sunshine. Looking ahead, a warmer weather pattern finally appears on the horizon likely beginning during the 3rd week of May and tropical season will not be far behind.
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The temperature reached 74 degrees yesterday at Philly Intl Airport, but a cold frontal passage ushered in considerably cooler air for today with mid-day readings still in the 50’s. It’ll turn even chillier on Wednesday in the Mid-Atlantic region with plenty of clouds around and occasional showers. In fact, some spots may experience some of the lowest maximum temperatures ever recorded for the 6th of May in this unusually cool air mass for this time of year. An even colder air mass is headed this way for the beginning of the Mother’s Day weekend and Saturday could turn out to be quite an amazing weather day in the Mid-Atlantic and Northeast US.
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It turns cooler today and it stays quite cool during the rest of the work week. In fact, maximum temperatures on Wednesday may turn out to be some of the lowest ever recorded here for the 6th of May and there will be some rain shower activity throughout the Mid-Atlantic region. More rain will reach us on Friday as a strong cold front arrives and it'll turn even colder for the start of the Mother's Day weekend. Temperatures on Saturday will be far below-normal and there will be a stiff NW wind. A rain shower or two cannot be ruled out and even a snow shower is possible on Saturday in some of the higher elevation interior locations well to the west and north of the District. It stays cool on Sunday, but it'll be more bearable as winds will be down and sunshine should prevail. Another cold air outbreak is destined to reach the Mid-Atlantic region later next week.
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The contrast between this past weekend and next weekend will be quite remarkable in the Mid-Atlantic region and Northeast US. An unusually cold air mass for this time of year will drop into the Mid-Atlantic and Northeast US by the early part of the upcoming Mother’s Day weekend and it will contrast markedly with the above-normal temperatures experienced this past Saturday and Sunday. In fact, the chill that is headed this way for the late week/weekend may very well result in near record lows across a wide region of the nation extending from the Rockies to the eastern seaboard and snow is even a possibility in the interior higher elevation locations of the Mid-Atlantic and Northeast US. Cold air outbreaks from Canada into the central and eastern US will quite likely continue until at least the middle of the month May.
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Unfortunately, the nice and warm weekend that we just experienced does not mean that the cold air outbreaks are over for the Mid-Atlantic region. In fact, there could be some record or near record cold in much of the central and eastern US by the upcoming weekend. It’ll turn out to be quite windy today and just a bit cooler compared to Sunday and then turn even cooler for the remainder of the work week. An even colder air mass for this time of year will arrive by the upcoming Mother's Day weekend and highs on Saturday are likely to be confined to the 50's with overnight lows in the 30's and it'll remain chilly on Sunday.
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